25 Jan AN AMERICAN NATIONAL STANDARD. ASME BTH-1– (Revision of ASME BTH-1–). Design of. Below-the-Hook. Lifting Devices. Buy ASME BTH 1: DESIGN OF BELOW-THE-HOOK LIFTING DEVICES from SAI Global. ASME BTH Design of Below the Hook Lifting Devices Reduced – Download as PDF File .pdf), Text File .txt) or read online.

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Fillet weld size is specified by leg width, but stress is determined by effective throat thickness.

The lifting device specifications shall state the location of the operator interface chosen by a qualified person from the following options: Participation by federal agency representative s or person s affiliated with industry is not to be interpreted as government or industry endorsement of this code or standard. The design of lifting attachments may be addressed by existing industry design standards.

Welding of lifters fabricated from metals other than steel shall be performed in accordance with a suitable 22011 specification as determined by a qualified person, provided the quality and inspection requirements are equal to or greater than those required by this Standard. For a complete-penetration groove weld, the effective throat thickness is the thickness of the thinner part joined.

The design factors are given in para. Shackles in round holes Flat plate beam Stiffeners prevent out-of-plane buckling C In the event that a lifter is expected to be subjected to impact loading greater than these values, a qualified person shall include an additional impact factor to account for such loads. However, members of the construction community expressed the need for design criteria more suitable to their operating conditions, including a lower design factor, and the necessity to address other failure modes such as fracture, shear and buckling, and design topics such as impact and fasteners.

The design criteria set forth are bt requirements that may be increased at the discretion of the lifting device manufacturer or a qualified person.


To prevent premature wearing of the wire rope, the sheave surfaces need to be smooth and tapered to allow the wire rope to easily slip into and seat in the sheave rope groove. As such, users of this Standard may interact with the Committee by brh interpretations, proposing revisions, and attending Committee meetings. Fillet welds in holes or slots are not to be considered plug or slot welds.

No standards have been found for design factors of asmf components. The BTH Committee developed a set of static and dynamic load spectra based on limited crane loads research and the experience of the Committee members.

If magnetic contactors are included within the static assembly, they shall be rated in accordance with para. The Committee recognizes that in some special low headroom applications the sheave size may need to be smaller to accommodate the limited space available. This Standard will become effective 1 year after the Date of Issuance. The Eng-Tips staff will check this out and take appropriate action.


as,e Practical considerations of various work environments indicate that the high numbers of load cycles that correspond to Service Class 1 and higher commonly equate to usage conditions under which the design factor of Design Category A is inappropriate. All motion hazard guards shall a prevent entry of hands, fingers, or other parts of the body into a point of hazard by reaching through, over, under, or around the guard b not create additional motion hazards between the guard and the moving part c utilize fasteners not readily removable by people other than authorized persons d not cause 2011 additional hazards, if openings are provided for lubrication, adjustment, or inspection e reduce the likelihood of personal injury due to breakage of component parts f be designed to hold the weight of a lb kg person without permanent deformation, if used as a step Wire rope shall be of a recommended construction for lifting service.


The most conservative design shall be selected for use.

Malleable cast iron clips shall not be used. The average tensile stress on the bbth area through the pinhole shall not exceed the limits defined in para.

The fatigue design requirements in section are generally based on the provisions of AWS D The slenderness ratio equal to Cc defines the border between elastic and inelastic buckling. This section identifies requirements of fluid power systems and components for below-the-hook lifting devices.

aame Each symbol is defined where it is first used. These loads shall include the rated load, the weights of the individual components of the lifter, and other forces created by the operation of the lifter, such as gripping force or lateral loads. In order to inhibit unintentional operation of the lifter, one of the following options should be considered: The allowable shear stress expression is based on CMAA 70, which specifies the allowable shear stress as a function of the shear yield stress.

This code or standard was developed under procedures accredited as meeting the criteria for American National Standards.

ASME BTH – Structural engineering other technical topics – Eng-Tips

The effective weld area shall not exceed the cross-sectional area of the hole or slot. The formulas given in this section are taken from AISC with modifications as necessary to account for the design factors given in this Standard.

I am trying to understand where some of the equations come from. Control systems utilizing magnetic contactors shall have sufficient size and quantity for starting, accelerating, reversing, and stopping the lifter. ASME Standards are developed and maintained with the intent to represent the consensus of concerned interests.